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"We want to showcase some of the country's finest food and beverages by creating a menu with top quality New Zealand products," said Martin Snedden, chief executive of organisers Duco Events.

Broadcaster and author Kerre McIvor will MC both gala dinners. "Nigella will spend time talking about her philosophy on food and what she is up to, and will also take part in a question-and-answer session," Mr Snedden said.

The TV chef is donating her time to take part in the events which will help raise funds for The Rising Foundation, a South Auckland-based charity providing help to at-risk youth.

Organisers are aiming to raise at least $100,000 for the charity.

Ms Lawson will also appear at Paper Plus in Newmarket, Auckland, and Invercargill to meet fans and sign copies of her latest book Simply Nigella: Feel Good Food.